Which of the following substances can have variable composition?

a) diamonds

b) graphite

c) air

d) water

How does the density of solid water compare to the density of liquid water

The strength of an electric field depends on the

What unit is used to measure frequency?

A gas that exerts a pressure of? bar in a container with a volume of 0.5650 L will exert a pressure of 715.1 bar when transferred to a container with a volum of 1.204 L

Which of the following equations is balanced? 2Al + 3O2 → Al2O3 N2 + 2H2 → 2NH3 CH4 + 3O2 → CO2 + 2H2O 2Fe2O3 + 3C → 4Fe + 3CO2

Chemical reactions that release energy possess reactants with lower energy than their products. True or False Heat is the most common form of energy absorbed or released in chemical reactions. True or False

What is the reason for the low solubility of LiF (0.27 g per100 ml H2O) compared to CsF (367 g per 100 ml H2O) ?

Which of the following changes will decrease the total amount of gaseous solute able to be dissolved in a liter of liquid water? A.) increasing temperature B.) increasing pressure C.) decreasing surface area D.) decreasing temperature

In June there are fewer hours of daylight and less direct sunlight in the

What are two type of minerals?